From 4a0f3743c34b8f75e564dffd37a656cf63f89d24 Mon Sep 17 00:00:00 2001
From: Xin Pan <panxin.grad@gmail.com>
Date: Fri, 15 Jun 2018 17:03:36 +0800
Subject: [PATCH] Refine API doc

---
 python/paddle/fluid/layers/learning_rate_scheduler.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/python/paddle/fluid/layers/learning_rate_scheduler.py b/python/paddle/fluid/layers/learning_rate_scheduler.py
index 716cc7824ef..fe9b40b817d 100644
--- a/python/paddle/fluid/layers/learning_rate_scheduler.py
+++ b/python/paddle/fluid/layers/learning_rate_scheduler.py
@@ -209,6 +209,14 @@ def polynomial_decay(learning_rate,
 def piecewise_decay(boundaries, values):
     """Applies piecewise decay to the initial learning rate.
 
+    Args:
+        boundaries: A list of steps numbers.
+        values: A list of learning rate values that will be picked during
+            different step boundaries.
+
+    Returns:
+        The decayed learning rate.
+
     >>> boundaries = [10000, 20000]
     >>> values = [1.0, 0.5, 0.1]
     >>>
-- 
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